May you please explain the answers to these problems regarding natural selection
ID: 212528 • Letter: M
Question
May you please explain the answers to these problems regarding natural selection (including calculations and concepts used to derive answer choice)?
1) What is the average excess of allele n?
0
-0.05
0.5
1
none of the above
2) Given the value calculated above, what will happen to the n allele?
its frequency will increase
its frequency will decrease
its frequency will stay the same
3) After one generation of natural selection, what will be the frequency of the N allele?
0
-0.03125
0.46875
0.5
none of the above
4) What is the equilibrium frequency of the N allele?
0
0.46875
0.5
1
none of the above
5) The mode of selection operating in the given example would best be described as:
positive selection
negative/purifying selection
balancing selection
disruptive selection
6) Which of the following population-genetic processes and/or forces could result in further evolution at this locus?
genetic drift
introduction of new genetic variation via gene flow
a change in the system of mating
a change in the selective environment
all of the above
Given the following information: Genotypic deviation -0.3 Genotype frequency 0.2 0.6 0.2 Genotypes NV Relative fitness 0.5 0.1 0.6 0.1 0.8 0.5 -0.3 n this case, if expected genotype frequencies match EXACTLY!) observed genotype frequencies, then you can assume the deme is in HW equilibriunmExplanation / Answer
1. answer is 1.
The average excess of an allele is the difference between the trait value of individual carrying that allele and the overall mean.
In the above example NN:Nn:nn = 1:2:1 . So 4-3 = 1
2. . Its frequency remains same.
According to the Hardy-Weinberg equilibrium equation, the frequency of alleles in the population remains same.
3. After one generation of natural selection the frequency of N allele will be 0.5
because the given population is a stable population.
5. Mode of selection operating in the given example is balancing population.
6.The process which could result in further evolution at this locus is - all the factors given.
because Hardy-Weinberg equilibrium is affected by five factors: gene flow, genetic drift, genetic recombination , mutations and natural selection.